Battery pack

Abstract

The application provides a battery pack, comprising: a battery box, the battery box having a mounting cavity and a support beam arranged on one side of the mounting cavity along a length direction; a plurality of battery modules, the plurality of battery modules being arranged inside the mounting cavity along a width direction of the battery box; a connecting row, the connecting row being arranged along the width direction of the battery box, and two adjacent battery modules being electrically connected through the connecting row; a mounting assembly, a part of the mounting assembly being arranged on the connecting row, and another part of the mounting assembly being detachably arranged on the support beam, the connecting row being fixed to the inside of the battery box through the mounting assembly; the connecting row being electrically connected between at least two battery modules, the connecting row being a conductor and being communicated with the battery modules, at least a part of the connecting row being a flexible part, and a deformation direction of the flexible part being parallel to a length direction of the battery modules. The application solves the problem of unstable connection between the connecting row of the battery and the battery cell in the related art.

Description

Technical Field

[0001] This application relates to the field of battery equipment technology, and more specifically, to a battery pack. Background Technology

[0002] Currently, the design of battery connectors in CTP (Cell To Pack) power battery systems has significant technical limitations. CTP technology aims to improve the energy density and reduce costs of the battery pack by directly connecting the cells to the pack, eliminating the need for traditional module frames. However, this design does not fully consider the natural expansion and contraction of the cells during charging and discharging, a phenomenon known as "cell breathing." Cell breathing is a natural phenomenon caused by internal chemical reactions that lead to changes in the cell's volume, which becomes more pronounced after prolonged use and charge-discharge cycles.

[0003] In related technologies, battery connectors are typically rigid and directly welded to the terminals of the battery cells. When the battery cells expand, the weld joints between the connectors and the terminals are subjected to torsional forces due to the increase or decrease in cell thickness. In the long run, these torsional forces can lead to fatigue damage and even detachment of the weld joints, severely affecting the structural stability of the battery pack and the reliability of the electrical connections. Furthermore, since the expansion amounts of the individual cells or modules within the battery pack may be inconsistent, this differential expansion force further exacerbates the stress on the weld joints, increasing the risk of cracking at the weld joints between the cells and the connectors.

[0004] In other words, there is an issue of unstable connection between the battery connector and the battery cell in the relevant technology. Summary of the Invention

[0005] The main objective of this application is to provide a battery pack to solve the problem of unstable connection between the battery connector and the battery cell in related technologies.

[0006] To achieve the above objectives, this application provides a battery pack, comprising: a battery box having a mounting cavity and a support beam disposed along the length of one side of the mounting cavity; a plurality of battery modules disposed inside the mounting cavity along the width of the battery box; a connecting strip disposed along the width of the battery box, wherein adjacent battery modules are electrically connected through the connecting strip; a mounting assembly having a portion disposed on the connecting strip and another portion detachably disposed on the support beam, the connecting strip being fixed inside the battery box by the mounting assembly; the connecting strip being electrically connected to at least two battery modules, the connecting strip being a conductor and communicating with the battery modules, at least a portion of the connecting strip being a flexible portion, and the deformation direction of the flexible portion being parallel to the length direction of the battery modules.

[0007] Furthermore, the mounting assembly also includes connectors, with connectors at both ends of the connector strip. The connectors are fixedly connected to the battery module, and the connector strip is electrically connected to the battery module through the connectors.

[0008] Furthermore, along the height direction of the battery box, the top surface of the battery module is located above the top surface of the support beam, and the connecting strip is located on the top surface of the support beam.

[0009] Furthermore, the upper surface of the connector is flush with the upper surface of the connector bar.

[0010] Furthermore, along the width direction of the battery box, the top surfaces at both ends of the support beam have raised structures.

[0011] Furthermore, the protruding structure has an opening facing the connecting bar, which is able to avoid the connecting bar in the height direction of the battery box.

[0012] Furthermore, the installation components include: an insulating sleeve fitted onto the connecting bar; and a connecting structure mounted on the connecting bar via the insulating sleeve, the connecting structure being detachably mounted on the support beam.

[0013] Furthermore, the battery box also includes a support structure, which is disposed between the connecting bar and the support beam to provide insulating support for the connecting bar.

[0014] Furthermore, multiple support structures are provided and spaced apart along the width direction of the battery box, and the mounting components are located between two adjacent support structures.

[0015] Furthermore, the connection structure includes: a cable tie, which is sleeved on the insulating sleeve; and a connector, which is disposed on the cable tie and is detachably connected to the support beam.

[0016] Using the technical solution of this application, the battery pack includes a battery box, multiple battery modules, a connecting strip, and a mounting assembly. The battery box has a mounting cavity and a support beam disposed on one side of the mounting cavity along its length. The multiple battery modules are disposed inside the mounting cavity along the width direction of the battery box. The connecting strip is disposed along the width direction of the battery box, and adjacent battery modules are electrically connected through the connecting strip. A portion of the mounting assembly is disposed on the connecting strip, and another portion of the mounting assembly is detachably disposed on the support beam. The connecting strip is fixed inside the battery box by the mounting assembly. The connecting strip is electrically connected to at least two battery modules. The connecting strip is a conductor and communicates with the battery modules. At least a portion of the connecting strip is a flexible part, and the deformation direction of the flexible part is parallel to the length direction of the battery module.

[0017] By introducing a flexible section into the connector, the torsional force caused by the different expansion amounts of the two battery modules during charging and discharging can be effectively absorbed, preventing connection failure due to torsional force at the connection point between the connector and the battery modules. Since multiple battery modules are arranged inside the mounting cavity along the width direction of the battery pack, and the deformation direction of the flexible section is parallel to the length direction of the battery modules, the expansion or contraction of the battery modules can be absorbed by the deformation of the flexible section. This protects the connection point between the connector and the battery modules from stress, allowing the connector to remain stable during battery module expansion or contraction, improving the reliability and lifespan of the battery pack. Furthermore, the connector is fixed inside the battery pack by mounting components and is detachably mounted on the support beam, ensuring an insulated connection between the connector and the battery pack and maintaining stability, thus preventing any impact on the electrical connection between the connector and the battery modules. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 A schematic diagram of the connection bar and mounting components in an optional embodiment of this application is shown;

[0020] Figure 2 This invention provides a partial structural schematic diagram of a battery box and battery module according to an optional embodiment of the present application.

[0021] Figure 3 A partial structural schematic diagram of a battery pack according to an optional embodiment of this application is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Connecting strip; 11. Connector; 12. Flexible part; 20. Battery module; 30. Battery box; 31. Support beam; 311. Hole; 33. Support structure; 40. Mounting component; 41. Insulating sleeve; 42. Connection structure. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0027] To address the problem of unstable connection between the battery connector and the battery cell in related technologies, this application provides a battery pack.

[0028] like Figures 1 to 3 As shown, the battery pack includes a battery box 30, multiple battery modules 20, a connecting strip 10, and a mounting assembly 40. The battery box 30 has a mounting cavity and a support beam 31 disposed along the length direction on one side of the mounting cavity; the multiple battery modules 20 are disposed inside the mounting cavity along the width direction of the battery box 30; the connecting strip 10 is disposed along the width direction of the battery box 30, and adjacent battery modules 20 are electrically connected through the connecting strip 10; a portion of the mounting assembly 40 is disposed on the connecting strip 10, and another portion of the mounting assembly 40 is detachably disposed on the support beam 31, and the connecting strip 10 is fixed inside the battery box 30 through the mounting assembly 40; the connecting strip 10 is electrically connected to at least two battery modules 20, the connecting strip 10 is a conductor and communicates with the battery modules 20, at least a portion of the connecting strip 10 is a flexible part 12, and the deformation direction of the flexible part 12 is parallel to the length direction of the battery module 20.

[0029] By introducing a flexible section 12 into the connecting strip 10, the torsional force caused by the different expansion amounts of the two battery modules 20 during charging and discharging can be effectively absorbed, preventing connection failure due to torsional force at the connection point between the connecting strip 10 and the battery modules 20. Since multiple battery modules 20 are arranged inside the mounting cavity along the width direction of the battery box 30, and the deformation direction of the flexible section 12 is parallel to the length direction of the battery modules 20, the expansion or contraction of the battery modules 20 can be absorbed by the deformation of the flexible section 12, thereby protecting the connection point between the connecting strip 10 and the battery modules 20 from stress. The connecting strip 10 can remain stable when the battery modules 20 expand or contract, improving the reliability and service life of the battery pack. Furthermore, the connecting strip 10 is fixed inside the battery box 30 by the mounting assembly 40 and is detachably mounted on the support beam 31, ensuring an insulated connection between the connecting strip 10 and the battery box 30 and maintaining stability, thus avoiding interference with the electrical connection between the connecting strip 10 and the battery modules 20.

[0030] like Figure 1 As shown, the mounting assembly 40 also includes connectors 11. Connectors 11 are respectively provided at both ends of the connecting strip 10. The connectors 11 are fixedly connected to the battery module 20, and the connecting strip 10 is electrically connected to the battery module 20 through the connectors 11. The design of the connectors 11 ensures a stable connection between the connecting strip 10 and the battery module 20, while also providing a path for electrical conduction. The fixed connection between the connectors 11 and the battery module 20 can disperse the force when the battery module 20 expands, reduce stress concentration on the connecting strip 10, and effectively protect the electrical connection points, preventing connection failure due to the expansion of the battery module 20, thus enhancing the electrical connection reliability of the battery pack.

[0031] like Figure 1 As shown, along the height direction of the battery box 30, the top surface of the battery module 20 is located above the top surface of the support beam 31, and the connecting strip 10 is disposed on the top surface of the support beam 31. This layout allows the connecting strip 10 to be directly mounted on the support beam 31, simplifying the internal structure of the battery pack. Placing the connecting strip 10 on the top surface of the support beam 31 allows the structure of the support beam 31 to secure the connecting strip 10, while avoiding direct contact between the connecting strip 10 and the battery module 20, reducing the risk of electrical short circuits. This arrangement not only simplifies the battery pack assembly process but also improves the safety of the battery pack.

[0032] like Figure 1 As shown, the upper surface of the connector 11 is flush with the upper surface of the connector 10. The flush upper surface can prevent additional stress from being generated when the connector 10 is fixed, thereby protecting the electrical connection between the connector 10 and the battery module 20 from stress, improving the reliability of the electrical connection between the connector 10 and the battery module 20, and simplifying the fixing process of the connector 10.

[0033] like Figure 1 As shown, the top surfaces of both ends of the support beam 31 have raised structures along the width direction of the battery box 30. The raised structures provide additional support and fixing points for the connection bar 10, protecting the electrical connection between the connection bar 10 and the battery module 20 from stress and enhancing the electrical connection reliability of the battery pack.

[0034] like Figure 1 As shown, the protruding structure has an opening facing the connecting row 10, which allows the connecting row 10 to be avoided in the height direction of the battery box 30. This avoidance of direct contact between the connecting row 10 and the support beam 31 reduces the risk of electrical short circuits.

[0035] like Figure 1 As shown, the mounting assembly 40 includes an insulating sleeve 41 and a connecting structure 42. The insulating sleeve 41 is fitted onto the connecting bar 10; the connecting structure 42 is mounted on the connecting bar 10 via the insulating sleeve 41 and is detachably mounted on the support beam 31. The insulating sleeve 41 provides initial fixation for the connecting bar 10, ensuring its positioning accuracy during subsequent assembly. It also isolates the electrical connection between the connecting bar 10 and the support beam 31, providing insulation protection for the connecting bar 10 and preventing electrical short circuits. Furthermore, the detachable design of the connecting structure 42 makes the installation and maintenance of the connecting bar 10 more convenient.

[0036] like Figure 1 As shown, the battery box 30 also includes a support structure 33, which is disposed between the connecting strip 10 and the support beam 31 to provide insulating support for the connecting strip 10. The support structure 33 increases its contact area with the battery box 30, preventing excessive deformation of the flexible part 12 under uncontrolled conditions. At the same time, it can isolate the electrical connection between the connecting strip 10 and the support beam 31, ensuring the stability of the connecting strip 10 and the reliability of the electrical connection.

[0037] like Figure 1 As shown, multiple support structures 33 are provided and spaced apart along the width direction of the battery box 30, and the mounting assembly 40 is disposed between two adjacent support structures 33. The arrangement of multiple support structures 33 can provide multiple support points, evenly distribute the weight and force of the connecting strip 10, avoid excessive deformation of the connecting strip 10 when the battery module 20 expands or contracts, and ensure the stability of the connecting strip 10 and the reliability of the electrical connection.

[0038] like Figure 1As shown, the connecting structure 42 includes a cable tie and a connector. The cable tie is sleeved on the insulating sleeve 41; the connector is disposed on the cable tie and is detachably connected to the support beam 31. The combination of the cable tie and the connector enables the fixing and electrical connection of the connecting row 10, while providing the convenience of detachment. The cable tie can fix the connecting row 10 to the support beam 31, while the detachable connection between the connector and the support beam 31 facilitates the installation and maintenance of the connecting row 10, improves the installation convenience and electrical connection stability of the connecting row 10, and simplifies the fixing process of the connecting row 10.

[0039] Example 1

[0040] like Figures 1 to 3 As shown, the battery pack includes a battery box 30, two battery modules 20, a connecting strip 10, and a mounting assembly 40. The two battery modules 20 are located at opposite ends of the connecting strip 10. When the battery modules 20 expand to different degrees during charge and discharge cycles, the flexible portion 12 of the connecting strip 10 can absorb this expansion displacement through the elastic deformation of its own material. This deformation will not be transmitted to both ends of the connecting strip 10, thereby preventing structural damage to the weld joints between the connecting strip 10 and the battery modules 20 due to torsional forces.

[0041] In this embodiment, the welding area between the connecting strip 10 and the terminal post of the battery module 20 uses Al_1060H24 state material, which has good welding performance and conductivity. The flexible part 12 uses a soft aluminum material with greater elasticity and ductility to accommodate the expansion or contraction of the battery cell in the thickness direction of the battery module 20. These two materials are connected by polymer diffusion welding, ensuring a stable bond between the materials.

[0042] In this embodiment, the support structure 33 is a support foam, which increases its contact area with the battery box 30 and prevents the flexible part 12 from undergoing excessive deformation under uncontrolled conditions, thus affecting the stability of the welding points between the connecting strip 10 and the battery module 20.

[0043] In this embodiment, the insulating sleeve 41 is made of cloth tape to initially fix the connecting strip 10, ensuring its positioning accuracy in the subsequent assembly process.

[0044] In this embodiment, the support beam 31 has holes 311, which allow the cable ties to engage with the holes 311 to securely fix the connecting strip 10 inside the battery box 30. This fixing method allows for a certain amount of displacement space without compromising the structural integrity of the connecting strip 10.

[0045] In this embodiment, the terminal posts of the battery cells in the battery module 20 are connected to the connecting bus 10 by laser welding, thereby achieving electrical connection and physical fixation between the battery cells and the connecting bus 10.

[0046] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0047] 1. By introducing a flexible part 12 into the connecting strip 10, the torsional force caused by the different expansion amounts of the two battery modules 20 during charging and discharging can be effectively absorbed, thus avoiding connection failure due to torsional force at the connection point between the connecting strip 10 and the battery module 20.

[0048] 2. Multiple battery modules 20 are arranged inside the mounting cavity along the width direction of the battery box 30. By setting the deformation direction of the flexible part 12 to be parallel to the length direction of the battery module 20, the expansion or contraction of the battery module 20 can be absorbed by the deformation of the flexible part 12, thereby protecting the connection between the connecting strip 10 and the battery module 20 from stress. The connecting strip 10 can remain stable when the battery module 20 expands or contracts, improving the reliability and service life of the battery pack.

[0049] 3. The connecting strip 10 is fixed inside the battery box 30 by the mounting component 40 and is detachably mounted on the support beam 31, which can ensure that the connecting strip 10 and the battery box 30 are insulated and remain stable, avoiding affecting the electrical connection between the connecting strip 10 and the battery module 20.

[0050] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0053] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized by, include: A battery box (30) having a mounting cavity and a support beam (31) disposed on one side of the mounting cavity along the length direction; Multiple battery modules (20) are disposed inside the mounting cavity along the width direction of the battery box (30); A connecting bar (10) is provided along the width direction of the battery box (30), and two adjacent battery modules (20) are electrically connected through the connecting bar (10). Mounting assembly (40), a portion of which is disposed on the connecting row (10), and another portion of which is detachably disposed on the support beam (31), wherein the connecting row (10) is fixed to the interior of the battery box (30) by means of the mounting assembly (40); The connecting bar (10) is electrically connected to at least two of the battery modules (20). The connecting bar (10) is a conductor and connects to the battery modules (20). At least a portion of the connecting bar (10) is a flexible part (12), and the deformation direction of the flexible part (12) is parallel to the length direction of the battery module (20).

2. The battery pack according to claim 1, characterized in that, The mounting assembly (40) further includes a connector (11), and the connector (11) is provided at both ends of the connecting strip (10). The connector (11) is fixedly connected to the battery module (20), and the connecting strip (10) is electrically connected to the battery module (20) through the connector (11).

3. The battery pack according to claim 2, characterized in that, Along the height direction of the battery box (30), the top surface of the battery module (20) is located above the top surface of the support beam (31), and the connecting row (10) is disposed on the top surface of the support beam (31).

4. The battery pack according to claim 3, characterized in that, The upper surface of the connector (11) is flush with the upper surface of the connector row (10).

5. The battery pack according to claim 1, characterized in that, Along the width direction of the battery box (30), the top surfaces of both ends of the support beam (31) have a raised structure.

6. The battery pack according to claim 5, characterized in that, The protruding structure has an opening toward the connecting bar (10), the opening being able to avoid the connecting bar (10) in the height direction of the battery box (30).

7. The battery pack according to claim 1, characterized in that, The mounting component (40) includes: An insulating sleeve (41) is fitted onto the connecting bar (10); A connecting structure (42) is provided on the connecting row (10) through the insulating sleeve (41), and the connecting structure (42) is detachably provided on the support beam (31).

8. The battery pack according to claim 1, characterized in that, The battery box (30) also includes a support structure (33), which is disposed between the connecting row (10) and the support beam (31) for insulating support of the connecting row (10).

9. The battery pack according to claim 8, characterized in that, The support structure (33) is provided in multiple ways and is spaced apart along the width direction of the battery box (30), and the mounting assembly (40) is provided between two adjacent support structures (33).

10. The battery pack according to claim 7, characterized in that, The connection structure (42) includes: Cable ties, which are sleeved on the insulating sleeve (41); A connector is disposed on the cable tie and is detachably connected to the support beam (31).

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